> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/use-cases/interoperability-examples/skype-for-business-s4b-tcp.md).

# Skype for Business S4B TCP

## Introduction

This article describes how to set up a Telcobridges ProSBC for interworking between an ITSP’s SIP Trunk and a Skype For Business Mediation Server using a TCP connection.

NOTE: The SIP Trunk uses G.711 in this test. There is no transcoding available.

### Prerequisites

* ProSBC devices must be installed as described in release 3.1.x. Release 3.0.x is not supported for TCP connections installation guides.
* Skype for Business 2015. For additional information on Skype for Business 2015, visit [Microsoft](http://www.microsoft.com/)

### Example Environment

<figure><img src="/files/fCWIDP9Q9FZKAHBrcZ6U" alt=""><figcaption></figcaption></figure>

**ProSBC Configuration for S4B**

| <p>(Step 1)<br>Create IP Network</p>                                                                                                                                                                                                                                                                                  | <p>(Step 2)<br>Create Protocol Stack</p>                                                                                                                                                                                                                                                                                                                                                                                                                  | <p>(Step 3)<br>Create Call Route</p>                                                  |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------- |
| <ul><li><a href="/pages/4Da0Y3tkR3YPkiQiMJq4">Configuring an IP Virtual Port</a></li><li><a href="/pages/7IjxZtyxERk988tkvjsb">Configuring a VLAN</a></li><li><a href="/pages/ZYQWWTQHLo88LCavuZ5C">Configuring IP Interfaces</a></li><li><a href="/pages/NQKpeugKPfvYlTTGh7AK">Create an IP port range</a></li></ul> | <ul><li><a href="/pages/NQKpeugKPfvYlTTGh7AK">Create an IP port range</a></li><li><a href="/pages/VG69umnT77U6581Yi96D">Create a SIP stack</a></li><li><a href="/pages/jvLDDqDqfgCJs0rS860W">Create a SIP transport server</a></li><li><a href="/pages/0aNbDh4Fvt05NbBm5vzb">Modify profile</a></li><li><a href="/pages/caC9hju5KNDcBruRFiOH">Allocate a SIP NAP</a></li><li><a href="/pages/cUU897A6h3aW5FNdtr9i">Allocate an open SIP NAP</a></li></ul> | <ul><li><a href="/pages/d4TYj9I5RiFaLe6xDXIx">Create a first call route</a></li></ul> |

### Example Configuration

ProSBC SIP trunking configuration for Microsoft Skype for Business.

* [Skype for Business Example Configuration - TCP](/configuration-details/configuration-by-use-case/skype-for-business-example-configuration.md)

### Troubleshooting

<table><thead><tr><th width="200">Call Trace</th><th width="200">Test Call</th><th width="200">TBReport</th><th width="200">Advanced Troubleshooting of ProSBC</th></tr></thead><tbody><tr><td><ul><li><a href="/pages/wANvjzXmam8kffkMPw9X">Configure call trace</a></li><li><a href="/pages/0xUPGJa2HODY3Q6dXomj">Retrieve call trace</a></li></ul></td><td><ul><li><a href="/pages/X5qsI1juaiqbPcEAM4kK">Creating a Test Call</a></li></ul></td><td><ul><li><a href="/pages/o5WkY2J8kt6xmZ8P9npo">Capture a report of the system</a></li></ul></td><td><ul><li><a href="/pages/JtFwsTqktzofDpi5TFoE">Advanced Troubleshooting of ProSBC</a></li></ul></td></tr></tbody></table>


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